The Spanish horno, for “oven,” sounds unrelated to any English counterpart.

But it is in fact a close cousin of furnace. Both come from the Latin formus, meaning “warn”.

How did such dissimilar words end up such close cousins?

Because most Latin words that began with an f- followed by a vowel ended up evolving in Spanish (alone among the romantic languages) into an h-. Thus the h-r-n of horno maps almost exactly to the f-r-n of furnace. In both cases, the original -m- evolved into an -n- in the root. But that is a very common transition too, with both sounds being so similar.

Nerds love to pattern-match, to find commonalities among everything. Our approach to learning languages revolves (the same -volve- that is in "volver", to "return") around connecting the Spanish words to the related English words via their common etymologies - to find the linguistic patterns, because these patterns become easy triggers to remember what words mean. Want to know more? Email us and ask: [email protected]